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KMID : 1114620140110010020
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Journal of the Korean Society for Breast Screening
2014 Volume.11 No. 1 p.20 ~ p.24
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Evaluation of Breast Density Using Domestic Digital Mammography Unit: Comparison with Foreign-Made Digital Mammography Unit
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Kim Won-Hwa
Chang Jung-Min
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Abstract
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Purpose: To evaluate mammographic breast density in mammograms performed from digital mammography unit made by domestic manufacturer and compare mammograms performed by domestic and foreignmade digital mammography units in evaluation of mammographic density.
Materials and Methods: We included 77 women who performed routine mammography unit using domestic digital mammography unit and had previous mammograms using foreign-made digital mammography unit within 1 year. For qualitative mammographic density evaluation, one radiologist graded breast density using 4-point Breast Imaging-Reporting and Data System (BI-RADS; grade 1, almost entirely fatty; grade 2, scattered fibroglandular; grade 3, heterogeneously dense; grade 4, extremely dense). For quantitative mammographic density evaluation, another radiologist measured breast density using computer software (Cumulus) in percentage of glandular tissue by total breast tissue. We used coefficient of intraclass correlation (ICC) analysis for comparison of breast density in mammograms between domestic and foreign-made digital mammography units.
Results: For mammograms performed by domestic digital mammography unit, there were 0, 19 (24.7%), 38 (49.4%), and 20 (26.0%) women for grade 1, 2, 3, and 4 mammographic density, respectively. For mammograms performed by foreign-made digital mammography unit, there were 0, 12 (15.6%), 40 (51.9%), and 25 (32.5%) women for grade 1, 2, 3, and 4 mammographic density, respectively. ICC value in BIRADS density between domestic and foreign-made digital mammography unit was 0.673 (95% confidence interval, 0.530, 0.779; P value < 0.0001), suggesting a moderate consistency. In qualitative analysis, the mean mammographic density from mammograms performed by domestic digital mammography unit was 26.3% and the mean mammographic density from mammograms performed by foreign-made digital mammography unit was 28.1%; there was no significant statistical difference (P value = 0.110). ICC value in mammographic density between domestic and foreign-made digital mammography units was 0.787 (95% confidence interval, 0.684, 0.859; P value < 0.0001), suggesting a considerable consistency.
Conclusion: Mammographic density in mammograms performed by domestic digital mammography unit was similar to that in mammograms performed by foreign-made digital mammography unit. Our results suggest that domestic digital mammography unit can be used in evaluation of mammographic density.
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KEYWORD
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Digital mammography, Domestic mammographic unit, Breast density
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